*{
    margin: 0;
    padding: 0;
}
body{
    background-image: url("../image/16sucai_p567c108.JPG");
    background-repeat: no-repeat;
    background-size: 100%;
}
.center{
    position: relative;
    top: 150px;
    width: 20%;
    margin: 0 auto;
    background-color: grey;
    padding-top: 80px;
    padding-bottom: 80px;
    padding-left: 8%;
    padding-right: 4%;
    opacity: 0.6;
    border-radius: 5%;
}
.center:hover{
    opacity: 1;
}
.center>input{
    margin-top: 10px;
    border: 0;
    border-radius: 15%;
    padding: 5px;
}
.btn{
    margin-left: 55px;
    margin-top: 10px;
    border: 0;
    border-radius: 15%;
    padding: 5px;
}
.btn:hover{
    background-color: aqua;
}
a>img{
    width: 5%;
    margin-left: 20px;
    margin-top: 20px;
}